Finding the Fourth Proportional to 9,389.05, 12,958.31 and 5,355.86

Step by Step Solution

1. Step 1: Write the proportion equation
   9,389.05 : 12,958.31 = 5,355.86 : x
2. Step 2: Convert to fraction form
   9,389.05/12,958.31 = 5,355.86/x
3. Step 3: Cross multiply
   9,389.05x = 12,958.31 × 5,355.86
4. Step 4: Simplify right side
   9,389.05x = 69,402,842.79
5. Step 5: Solve for x
   x = 69,402,842.79/9,389.05
6. Step 6: Final answer
   x = 7,391.89